When Pownce launched, the reasoning for it was that Facebook didn't have the features Kevin Rose and friends wanted. But, as luck would have it, Facebook grew up a bunch and said, "We have lots of people, and lots of money, lets build in all of these features." Then, Pownce was (excuse the pun) pownced.

How do you get users to use Facebook, and Pownce, if they already use Facebook and there's no longer a compelling reason to use Pownce?